Carrier 50JB064, 50JB034, 50JB048, 50JB054, 50JB038, 50JB044 manual Product Integrated Control Features

Date:	Supersedes:	50JB034, 038, 044, 048, 054, 064		Rev.:
		SINGLE-PACKAGE COOLING UNITS,	50JB
		EXTENDED CHASSIS
		PRODUCT INTEGRATED CONTROLS
JOB NAME:		LOCATION:
BUYER:		BUYER P.O. #	CARRIER #
UNIT NUMBER:		MODEL NUMBER:
PERFORMANCE DATA CERTIFIED BY:			DATE:

DESCRIPTION

50JB units are completely packaged, pre-wired and precharged cooling only units with PRODUCT INTEGRATED CONTROLS.

50JB units are built for horizontal supply and return applications. Their waterproof construction makes them ideally suited for installation on the accessory roof curb which is NRCA approved or slab mounting.

Units are either CONSTANT VOLUME or VARIABLE AIR VOLUME depending on the factory- installed options selected.

Units include space and coil tracks downstream of evaporator for ®eld or factory installation of auxiliary devices.

PRODUCT INTEGRATED CONTROL FEATURES

STANDARD CONTROL FUNCTIONS

Unit compatible with CARRIER COMFORT NETWORK or stand alone operation.

Constant Volume or Variable Air Volume control. Four to six stages of compressor unloading possible.

Supply fan control based on occupancy schedule using 365-day electronic timeclock with holiday scheduling.

Time schedule override through the space temperature sensor provided with the unit.

Compatible with 37H and 45 Series PIC terminals to form a Digital Air Volume system (DAV).

Building pressurization control in conjunction with modulating power exhaust option.

Supply duct static pressure controlled through inlet guide vanes or ®eld or factory supplied inverter.

Head pressure control to −20° F. Head pressure controlled by saturated condensing temperature, low ambient control utilizes Motormaster II fan cycling.

Lead-lag compressor control to even out run time.

Self-diagnostic run test con®rms control and component operation at unit commissioning. Self-diagnostic troubleshooting codes indicate the reason unit tripped to expedite unit repair. Codes expand to English Text.

Control of a two-speed supply fan motor on CV applications. (Two- speed motor available on Special Order.)

Building Purge Mode ¯ushes building interior with outdoor air to remove contaminants before occupancy.

Adaptive Optimal Start minimizes the amount of time and energy required before entering the occupied mode.

Unoccupied Mode Free Cooling Ð units with optimal economizer will utilize free cooling whenever possible to maintain the unoc- cupied set point.

Input/Output of data and monitoring of alarms can be done remotely using Building Supervisor, or at the unit using the accessory HSIO module.

Delayed Mechanical Cooling Ð units with optional economizer will utilize cooling to cool the space 3 degrees below the occupied set point to delay the need for mechanical cooling.

ADDITIONAL CONTROL FUNCTIONS

AVAILABLE THROUGH FACTORY-INSTALLED ``OPTION MODULE''

Provides a discrete output with occupancy control for use as speci- ®ed by the customer.

Controls a ®eld installed humidi®er using a 4 to 20 mA or 2-stage output. Requires accessory humidity sensor.

Smoke Control functions (Building Pressurization and Smoke Purge) are provided through software. Terminals are provided to interface with ®eld supplied smoke/®re panel.

Provides a 4 to 20 mA output to direct or reverse proportional hot water control valve for ®eld supplied hydronic heating coil. Re- quires a ®eld supplied freezestat to protect coil.

Factory installed suction and discharge pressure transducers and suction temperature thermistors allow remote monitoring of these parameters and superheat to provide enhanced remote diagnostics.

Differential enthalpy control can be provided using ®eld installed accessory humidity sensors.

Economizer control ®eld con®gurable to:

ÐMaintain a minimum economizer set point position,

OR

ÐMaintain the minimum economizer position based on input from an IAQ sensor (®eld supplied 0 - 10 volt),

OR

ÐMaintain a constant cfm of outdoor air intake (Requires accessory Outdoor Air CFM package),

OR

ÐLook at all three above and maintain minimum economizer position based on the dominant parameter.

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